| Fraz Resources Consultancy Ltd | Professional & scientific | 2026 |
| Frazer Garner Associates Ltd | Professional & scientific | 2009 |
| Freaky Turtle Ltd | Wholesale & retail | 2023 |
| Fred Fowler Limited | Real estate | 1967 |
| Freddie Bowdler Limited | Professional & scientific | 2025 |
| Frederick C.Mitchell & Sons Limited | Manufacturing | 1950 |
| Fredol Enterprise Limited | Health & social care | 2023 |
| Free Spirits Education C.I.C. | Education | 2021 |
| Free Trade Consulting Ltd | Professional & scientific | 2021 |
| Freedom Healthnet Finance Ltd | Financial services | 2008 |
| Freedom Healthnet Limited | Financial services | 2003 |
| Freedom Healthnet Online Limited | Financial services | 2011 |
| Freedom Worldwide Healthcare Limited | Financial services | 2009 |
| Freedomelectric.Co.Uk Limited | Manufacturing | 2010 |
| Freekman House Limited | Wholesale & retail | 2022 |
| Freeman's Landscapes Limited | Administrative & support | 2019 |
| Freemynd Supplements Ltd | Manufacturing | 2025 |
| Freestar Media Limited | Extraterritorial | 2020 |
| Freeward International Group Ltd | Other services | 2022 |
| Freeway Mobile Tyres Ltd | Wholesale & retail | 2018 |
| Freightswift Forwarders Limited | Transport & logistics | 1994 |
| Frenches Green (Upton) Phase 2 Management Company Limited | Households | 2025 |
| Frequency in Flow Ltd | Financial services | 2025 |
| Frervital Ltd | Wholesale & retail | 2025 |
| Fresh Vibe Cleaning Services Ltd | Administrative & support | 2026 |
| Freshwater CB Ltd | Hospitality | 2005 |
| FRESS16 Ltd | Real estate | 2021 |
| Frest Developments Ltd | Real estate | 2018 |
| Fried Cactus Studio Ltd | Professional & scientific | 2019 |
| Friel Enterprises South Ltd | Construction | 2013 |
| Friel Property Limited | Extraterritorial | 2023 |
| Friel Tech Limited | Extraterritorial | 2010 |
| Friendly Cars (Dorset) Ltd | Transport & logistics | 2024 |
| Friendly Cars Ltd | Transport & logistics | 2024 |
| Friendly Villa (UK) Limited | Hospitality | 2009 |
| Friendly Waste Ltd | Construction | 2019 |
| Friendoor Ltd | Information & communication | 2025 |
| Fringe Media Limited | Information & communication | 2026 |
| Frnx Ltd | Wholesale & retail | 2025 |
| Frog Media Ltd | Information & communication | 2025 |
| Front Door Media Ltd | Information & communication | 2018 |
| Front MAN Trim Limited | Other services | 2025 |
| Frontiera Travel Limited | Professional & scientific | 2017 |
| Frontpace Ltd | Professional & scientific | 2026 |
| Frost & Co Professional Lettings Limited | Real estate | 2014 |
| Frost & Company (Parkstone) Limited | Real estate | 1996 |
| Frozen Feet Invest Ltd | Information & communication | 2023 |
| Frozen Feet Ltd | Extraterritorial | 2023 |
| FRQ Tools & Services Ltd | Wholesale & retail | 2024 |
| Fruit Investments Ltd | Financial services | 2016 |
| Fruit Music Ltd | Information & communication | 2023 |
| Fruit Properties Ltd | Real estate | 2023 |
| Fruitful Harvest Ltd | Information & communication | 2016 |
| Fryderyk Limited | Information & communication | 2024 |
| FSA Invest Limited | Real estate | 2024 |
| Fsacco Vehicle Design Ltd | Wholesale & retail | 2024 |
| FSJ Property Holdings Ltd | Real estate | 2026 |
| FST Services Limited | Construction | 1994 |
| FST Services Trustees Limited | Financial services | 2025 |
| FT Operations Limited | Professional & scientific | 2024 |
| FU Jian Property Ltd | Real estate | 2025 |
| Fuel Legal Limited | Other services | 2025 |
| Fulasina Ltd | Wholesale & retail | 2021 |
| Fulfilworks Ltd | Transport & logistics | 2023 |
| Full Ahead Ltd | Real estate | 2024 |
| Full Arch Dental System Ltd | Information & communication | 2018 |
| Full Circle Creative Ltd | Professional & scientific | 2024 |
| Full House Bookings Ltd | Hospitality | 2015 |
| Full Time Formula Ltd | Information & communication | 2025 |
| Fully Loaded Poole Ltd | Hospitality | 2023 |
| Fulvisol Ltd | Information & communication | 2023 |
| FUN Ideas Ltd | Wholesale & retail | 2011 |
| Funbit Limited | Real estate | 2001 |
| Function Labs Limited | Information & communication | 2026 |
| Functional Health Screening Limited | Health & social care | 2014 |
| Fundamental Marine Developments Limited | Manufacturing | 2013 |
| Funky Frog Ltd | Professional & scientific | 2020 |
| Funky Monkey Paintwork Company Ltd | Wholesale & retail | 2023 |
| Funky Mouse Ltd | Information & communication | 2021 |
| Funky Sock Company Ltd | Wholesale & retail | 2023 |
| Furever Friendz UK Pet Supplies Limited | Wholesale & retail | 2017 |
| Furnely Management Company Limited | Households | 1981 |
| Furni Ltd | Manufacturing | 2014 |
| Furnitura Ltd | Manufacturing | 2023 |
| Furniturebyjdm Ltd. | Wholesale & retail | 2019 |
| Furnitureco Ltd | Information & communication | 2020 |
| Furry Dolphin Marketing Limited | Wholesale & retail | 2025 |
| Furzey Ltd | Wholesale & retail | 2026 |
| Furzey Road Freehold Limited | Households | 1998 |
| Furzey Road Limited | Real estate | 2004 |
| Fusion Fitness Ltd | Other services | 2023 |
| Fusion Home Fitness Limited | Arts & recreation | 2023 |
| Fusion Infrastructure Limited | Construction | 2019 |
| Fusion Productions Ltd | Information & communication | 2023 |
| Fusion Rehousing Group Limited | Administrative & support | 2026 |
| Fustanaty Pro Ltd | Wholesale & retail | 2025 |
| Futura Digital Ecom Ltd | Wholesale & retail | 2025 |
| Futura Enterprises Ltd | Wholesale & retail | 2023 |
| Futura Medica 4HEALTH Ltd | Health & social care | 2025 |
| Futurago Limited | Wholesale & retail | 2025 |